Extending the Eigenvector 1 space to the optical variability of quasars  

作　　者：Yu-Feng Mao Jing Wang Jian-Yan Wei 

机构地区：[1]National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China [2]Graduate University of Chinese Academy of Sciences, Beijing, 100049, China

出　　处：《Chinese Journal of Astronomy and Astrophysics》2009年第5期529-537,共9页中国天文和天体物理学报（英文版）

基　　金：supported by the National Science Foundation of China (Nos. 10803008 and 10873017);National Basic Research Program of China.

摘　　要：We introduce a new physical parameter, the optical variability amplitude, to the well-established Eigenvector 1 space of quasars and test a sample of long-term B- band light curves of 42 Palomar-Green quasars monitored by Giveon et al. We find that the optical variability amplitude strongly correlates with the intensity ratio of FeⅡ to Hβ, Hβ width and peak luminosity at 5007A. We briefly discuss the physical meaning of our findings and suggest that the Eddington ratio may be a key factor in determining a quasar＇s variability.We introduce a new physical parameter, the optical variability amplitude, to the well-established Eigenvector 1 space of quasars and test a sample of long-term B- band light curves of 42 Palomar-Green quasars monitored by Giveon et al. We find that the optical variability amplitude strongly correlates with the intensity ratio of FeⅡ to Hβ, Hβ width and peak luminosity at 5007A. We briefly discuss the physical meaning of our findings and suggest that the Eddington ratio may be a key factor in determining a quasar＇s variability.

关 键 词：GALAXIES active -- quasars general 

分 类 号：P158[天文地球—天文学] O151.21[理学—数学]